ESP32-C3 SuperMini 开发板开箱

void setup() {
  pinMode(LED_BUILTIN, OUTPUT);  // 初始化板载LED引脚为输出模式
}

void loop() {
  digitalWrite(LED_BUILTIN, HIGH); // 点亮LED
  delay(1000);                     // 延时1秒
  digitalWrite(LED_BUILTIN, LOW);  // 熄灭LED
  delay(1000);                     // 延时1秒
}

#include <BLEDevice.h>
#include <BLEUtils.h>
#include <BLEScan.h>
#include <BLEAdvertisedDevice.h>
#include <Preferences.h>

Preferences preferences;
RTC_DATA_ATTR int sessionCount = 0;  // 本次上电期间的计数
RTC_DATA_ATTR bool isFirstBoot = true;

int scanTime = 5; // 扫描时长（秒）
BLEScan* pBLEScan;

class MyAdvertisedDeviceCallbacks: public BLEAdvertisedDeviceCallbacks {
    void onResult(BLEAdvertisedDevice advertisedDevice) {
      Serial.printf("发现设备: %s \n", advertisedDevice.getName().c_str());
      Serial.printf("设备地址: %s \n", advertisedDevice.getAddress().toString().c_str());
      Serial.printf("信号强度 (RSSI): %d dBm\n", advertisedDevice.getRSSI());
      Serial.println("-----------------------");
    }
};

void setup() {
  Serial.begin(115200);
  Serial.println("ESP32 BLE 扫描程序启动...");

  BLEDevice::init("");
  pBLEScan = BLEDevice::getScan(); // 创建扫描对象
  pBLEScan->setAdvertisedDeviceCallbacks(new MyAdvertisedDeviceCallbacks());
  pBLEScan->setActiveScan(true); // 主动扫描模式，获取更多信息
  pBLEScan->setInterval(100);
  pBLEScan->setWindow(99); // 必须小于或等于setInterval

      preferences.begin("stats", false);
  
    int totalBootCount = preferences.getInt("total", 0);
  
    if(isFirstBoot) {
        // 冷启动：从Flash恢复数据到RTC Memory
        totalBootCount++;
        preferences.putInt("total", totalBootCount);
        isFirstBoot = false;
    }
  
    sessionCount++;
  
    Serial.printf("本次上电启动次数: %d\n", sessionCount);
    Serial.printf("历史总启动次数: %d\n", totalBootCount);
  
    preferences.end();
}

void loop() {
  // 正确的代码：使用指针接收返回值
  BLEScanResults* foundDevices = pBLEScan->start(scanTime, false);
  
  Serial.print("发现设备数量: ");
  Serial.println(foundDevices->getCount());
  Serial.println("扫描结束");
  
  pBLEScan->clearResults(); // 清空结果，为下次扫描做准备
  delay(5000);
}